diff --git a/crates/languages/src/c/highlights.scm b/crates/languages/src/c/highlights.scm
index ef15a4b3453630..b80c462ae6d329 100644
--- a/crates/languages/src/c/highlights.scm
+++ b/crates/languages/src/c/highlights.scm
@@ -104,7 +104,7 @@
   (false)
 ] @boolean
 
-(null) @constant
+(null) @constant.builtin
 
 (identifier) @variable
 
diff --git a/crates/languages/src/cpp/highlights.scm b/crates/languages/src/cpp/highlights.scm
index 2a8235de1fa33e..b05e8cd6f97935 100644
--- a/crates/languages/src/cpp/highlights.scm
+++ b/crates/languages/src/cpp/highlights.scm
@@ -158,7 +158,7 @@ type :(primitive_type) @type.primitive
 [
   (null)
   ("nullptr")
-] @constant
+] @constant.builtin
 
 (number_literal) @number